<form class="form-signin" role="form" action="login" method="post">
	<input type="text" class="form-control" id="userId" name="userId"
		placeholder="用户名" required autofocus />
	<input type="password" class="form-control" id="password"
		name="password" placeholder="密码" required />
	<div class="center">
		<input type="radio" name="userType" id="userType2" value="2">
			教师 <input type="radio" name="userType" id="userType1" value="1">
				管理员 <label id="tips" style="color:red"> </label>
	</div>
	<button type="button" id="login">登录</button>
</form>
